Electrochemical Sensor for Detection and Degradation Studies of Ethyl Violet Dye

Abstract

In this work, a simple and sensitive electrochemical method was developed to determine ethyl violet (EV) dye in aqueous systems by using square wave anodic stripping voltammetry (SWASV) employing a glassy carbon electrode modified with acidic-functionalized carbon nanotubes (COOH- f CNTs). In square wave anodic stripping voltammetry, EV exhibited a well-defined oxidation peak at 0.86 V at the modified GCE. Impedance spectroscopy and cyclic voltammetry were used to examine the charge transduction and sensing capabilities of the modified electrode. The influence of pH, deposition potential, and accumulation time on the electro-oxidation of EV was optimized. Under the optimum experimental conditions, the limit of detection with a value of 0.36 nM demonstrates high sensitivity of COOH- f CNTs/GCE for EV. After detection, it was envisioned to devise a method for the efficient removal of EV from an aqueous system. In this regard a photocatalytic degradation method of EV using Ho/TiO 2 nanoparticles was developed. The Ho/TiO 2 nanoparticles synthesized by the sol–gel method were characterized by UV–vis, XRD, FTIR, SEM, and EDX. The photocatalytic degradation studies revealed that basic medium is more suitable for a higher degradation rate of EV than acidic and neutral media. The photodegradation kinetic parameters were evaluated using UV–vis spectroscopic and electrochemical methods. The results revealed that the degradation process of EV follows first-order kinetics.

Freestanding WS2-MWCNT Nanocomposite for Electrochemical Detection of Contaminants of Emerging Concern─Perfluorooctanoic Acid “A Forever Chemical” and Supercapacitor Applications

“…Based on our findings, it appears that the behavior of the reaction on the WS 2 -MWCNT surface was regulated by adsorption, as confirmed by the log I vs log ν plot. The observed slope and the correlation coefficient were found to be 0.766 and 0.999, respectively (Figure H), which are indicative of a surface-assisted reaction taking place at the sensor surface …”

“…The observed slope and the correlation coefficient were found to be 0.766 and 0.999, respectively (Figure 3H), which are indicative of a surfaceassisted reaction taking place at the sensor surface. 41 To conduct real-time analysis, we tested the specificity of the WS 2 -MWCNT electrode toward PFOA in the presence of various interfering ions. The signal generation of different metal salts and surfactants, including sulfates, nitrates, chloride, CTAB, and SBS, was established under optimized conditions.…”

Electrochemical detection and removal of brilliant blue dye via photocatalytic degradation and adsorption using phyto-synthesized nanoparticles

“…The limit of detection (LOD) of 0.109 nM and quantification (LOQ) of 0.369 nM were calculated using the following equations. 28 Here, σ symbolizes the standard deviation determined from the peak current value of the blank solution (twelve runs) and m indicates the slope that was obtained from the calibration plot of lower concentrations.…”

A Comprehensive Review on Adsorption, Photocatalytic and Chemical Degradation of Dyes and Nitro-Compounds over Different Kinds of Porous and Composite Materials

“…Among the approaches mentioned above, the electrochemical degradation route is more expensive than other approaches for dye degradation [ 199 ]. The main reason for reduced implementation of the electrochemical approach is high energy consumption, the requirement for more chemicals, and costly equipment [ 200 , 201 ]. Other challenges in implementing the electrochemical approach are the production of metabolites and other by-products during these processes.…”